#include <stdio.h>
#include <string.h>
#include <unistd.h>

int main() {
    write(1, "hello world", strlen("hello world"));
    pause();
    return 0;
}

// https://wenfh2020.com/2021/09/05/kernel-syscall/
// 一口气看完45个寄存器，CPU核心技术大揭秘 https://zhuanlan.zhihu.com/p/272135463